The hypothesis for this science fair project is that sugary liquids produce less urine then salty liquids do. The dependent variable in this hypothesis is the amount of urine produced and the independent variable in this hypothesis is the type of liquid that is drunk.
Supplies Needed
This science fair project will need several key pieces of equipment. First of all the student will need at least six to twelve test subjects that are generally healthy. The student will then need a urine collection and measuring device for each of their test subjects. These can be picked up at a medical supply company. The students will also need collection sheets which will be handed out to each test subject. Latex gloves can also be used when collecting urine volume samples.
The Experiment
To start with the student will need to conduct a control experiment. This will create a baseline of data to compare test results to. The control experiment will basically see how much urine is normally produced by each test subject on a daily basis. To collect this data each test subject will be given a urine volume collection container that fits into their toilet. They will then write down the volume of urine that they eliminate from their bodies on a daily basis over a week.
The test experiment will begin by dividing test subjects into two groups. Group A will be given sugary drinks and Group B will be given salty drinks. Each group will be assigned the same volume of liquid. The test subjects will be instructed not to drink anything other than their experiment liquids during the day. They will then monitor their urine output during test day 1, 2 and 3. The groups will then be given the other liquid type and the will be tested for another three days.
Data Analysis
The analysis of the data will involve several steps. First of all the students will need to organize the data by finding the average urine output for each test subject in the control experiment. This will create the baseline data. Next the average urine volume output for each test subject will be calculated for the sugary drink test. Finally the average urine volume output for each test subject will be calculated for the salty drink test. The results will be compared. Students will need to look for trends that indicate that the sugary drinks lead to a higher urine output change compared to the control than the salty drinks did to prove the hypothesis could be true. Otherwise the hypothesis is false
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